[PM2.5和O3的演变特征及其对唐山大气化合物污染的协同作用]
Li-Hui Han1,2, Tong Lan1,2, Shui-Yuan Cheng1,2
1Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China.
Huan jing ke xue= Huanjing kexue
|August 21, 2024
概括
颗粒物 (PM2.5) 度在2015-2021年期间下降,而臭氧 (O3) 在2017年达到峰值. 这两种污染物都表现出季节性变化,冬季PM2.5最高,夏季O3最高,受到空气质量运输和气象因素的影响.
科学领域:
- 大气化学和空气质量研究.
- 环境科学和污染监测.
- 气象对空气污染的影响.
背景情况:
- 空气污染,特别是细颗粒物 (PM2.5) 和臭氧 (O3),对公众健康和生态系统构成重大风险.
- 了解这些污染物的时空变化和影响因素对于有效的空气质量管理至关重要.
研究的目的:
- 调查2015年至2021年唐山PM2.5和O3的变异特征.
- 分析气象因素和空气质量运输对PM2.5和O3污染的影响.
- 揭示PM2.5和O3对大气化合物污染的协同影响机制.
主要方法:
- 关于大气污染物 (PM2.5,O3,SO2,NO2,CO) 和气象因素 (温度,相对湿度,风速) 的数据从2015年至2021年在唐山收集.
- 使用相关性分析来检查污染物和气象因素之间的关系.
- 利用逆向轨迹集群分析来评估空气质量运输的贡献.
主要成果:
- 从2015年到2021年,PM2.5度呈现下降趋势,而O3度呈现单模式趋势,在2017年达到峰值.
- 这两种污染物均表现出显著的季节性变化:冬季PM2.5最高,夏季最低;夏季O3最高,冬季最低.
- PM2.5与SO2,NO2和CO正相关;O3与辐射和温度正相关. 协同效应因季节性变化和PM2.5度而有所不同.
结论:
- 根据污染条件和方向,大气运输对PM2.5和O3污染的影响不同.
- 关于化合物污染的PM2.5和O3之间的协同效应在冬季是负的,在春季,夏季和秋季是正的.
- 当PM2.5超过150μg·m-3时,观察到与O3的负面协同效应.
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